Vacuum pneumatic hammer



Sept. 1, 1925.

L. E. GOLLY VACUUM PNEUMATIC HAMER Filed oct. 18. 1921 OMI Ratented ll,

new and useful Improvements in Vacuum A Pneumatic Hammers, of which the follow- UNITED STATES PATENT OFFICE.

Louis n. sour, or imw Yonx, Assienon 'ro .minis c. eurem, or a Y isri'zwiifonclic,i'snir.` i

vacunar rmn'ric =...,1.-

Appunti@ nea ontber- 18,1921. semi n. '508,534.

T o all whom. it may concern:

' Be it known that I Louis E. GoLLY, a

citizen-ofthe United'gtates, residing at 665. fBushwick Avenue, kin the borough of Brooklyn, in the 'countyof -Kings,'city and State of New-Yorlg'liave: invented certain isa specification.

l his -mvention relates to a vacuum neumatic'A hammer, and more particular y to the v adaptation and .arran ment of the parts, as will be pointed out.

The object of the invention is to provide a construction which is simple and efiicient more y' .hereinafter 'in operation for'pneumatically operating a hammer by the compression and rarefying of air through the action of a piston operating in a c linder or tube.

A furt er object of the invention is to rovide a device or tool of the character reerred to -which can be manutfactured'economically and which is capable of eas and ready application to its work and whic v can be readily controlled in its operation.

'Referring to the accom an g draw-i ings Figure 1 is a longitu ina section of ing n the drawings internally threa my device;y Figure 2 is alongitudinal section of the outer casing onthe lines 2--2 of Figure 3; Figure 3 is an end view ofthe outer casing looking in at the right of Figure 2; Figure 4 is an end view of Figure .5 looking in at the left; Fi re 5 is a section of the tool holder end o m device; and Figure 6 is an end view of ig'ure 5 lookin at the right.

7 is an outer casing bein ed at 8 so that it is ada te to screw over a similar external threa ing of a driver housing'9, and a cylinderk 10 is so constructed and mounted in the outer cas-` 'limit the downward motion of the cylinder 10. The cylinder 10 is externally threaded at 13 -so that it isv adapted to receive the 1nternal threading of a tool holder 14 so that the tool holder 14 is thereby rigidly secured to the cylinder 10. A spiral ring 15 is mounted over the cylinder 10 so t at it bears at the lower end on thetool holder 14 at the lshoulder 16 and bears at the upper end on The c linder 10 has a pin 19 which is adapted to fit into the cylindrical member 21 and a counter balance 2O is rigidly secured to said plate 18 and rotates ftherewith. The lower end of said plunger arm 22 ends in a ball 44 adapted to fit into a socket 24 of a plun er 25 which is ada ted to slide longitudine y on the inside o the cylinder 10. The lower end of the plunger 25 yterminates; in a cylindrical air cushion pocket 26 which is constructed and adapted to receive a head member 27 of a hammer 28 which is also adapted to slide longitudinally on the inside of the cylinder 10 :Ilhe upper end of the'driver housing ternear-the lower end'of said casing. The casend ofthe longitudinal opening 31, andlongitudinal air passages 41 are drilled in the tool holder 14 so as to connect the cylindrical cut out 40 with the outer air through the upper end of the tool holder.14. Air

ports '42 are cut through the toolholder 14 and the cylinder 10 where the same are joined by the threading 13 so as to connect the inside of the cylinder 10 through the air passages 41 with the outer air. The cylinder l0 also has air ports 45 and 46 which in the lower or normal position of the cylinder 10 register with the cylindrical borlngs 37 and 36, respectively.

The operation of my device is as follows:

A hammer, chisel, or other suitable tool 43 is-mounted in the usual way in the opening 30. The motor switch, which is not shown, is then turned on thereby rotating the driven plate 18 and the counterbalance 20 which travels therewith. The eccentric pin 19 and bearing 21 are thereby rotated eccentrically so as to carry the upper cylindrical member 23 and the connecting parts 22, 44 and plunger 25 back and forth on the inside of the cylinder 10, because of such eccentric rotation. The hammer 28 normally rests in the base of the inside of the cylinder 10, but as the operator presses down on the tool 43 in order to cause the tool to operate as desired the tool holder' 14 is thereby pushed up against the spring 15 which carries the cylinder 10 therewith so that the ports 45 are thereb pushed out of alignment with the cylin rical boring 37, and the rotation of the plunger 25 thereby causes a suction or vacuum on its upward motion which draws the hammer 28 up until the head 27 pushes part way into the cylindrical pocket 26 of the plunger 25 in which an air cushion is formed so that 27 does not actually contact with the head. of the pocket. The hammer 28 is then pushed downwardly by the downward stroke of the plunger 25 and hits the head otr' the tool 43 which projects suiiiciently from the cylindrical opening 31, so that the hammer 28 can come mto full contact therewith on the downward stroke. The air which would otherwise be compressed under the downward stroke of hammer 28 will hit the head of the tool 43 harder, thereby operating'fthe tool 43 in a more forceful manner. ort 32 serves to maintain atmospheric pressure on the inside of the driver housing 9.

I claim:

1. In a vacuum power hammer the combination of a power driven eccentric, a plunger havin an air cushion pocket and adapted to sli e in a cylinder longitudinally` movable in an outer casing having air ports, cylindrical cutouts and longitudinal orings connecting the lower pair of said :esencias cutouts, a tool holder separately connected to the lower endy of said cylinder, a hammer adapted to cushion in said plunger air pocket, air ports in said cylinder normally registering with said cylindrical cutouts in said outer casing, and means for interrupting such registration.

2. In a vacuum power hammer the combination of a power driven eccentric, an outer casing having air ports, cylindrical cutouts and longitudinal borings connecting said lower pair of said cutouts, la longitudinally movable cylinder mounted in said casing and limited thereby in its downward movement, a tool holder separably secured to said cylinder and under spring tension against said outer casing, a plunger having an air cushion pocket, a hammer 'adapted to slide in said cylinder and cushion in said pocket, and said cylinder cooperating with said casing for interrupting the maintaining of atmospheric pressure between said hammer and said plunger.

. 3. In a vacuum power hammer the combination of apower driven eccentric mounted in ahousing, an outer casing secured to said housing and having air ports at the upper and lower ends, three cylindrical cutouts ,and a longitudinal boring connecting the two lower cutouts a longitudinally movable cylinder mounted in said casing, a tool holder connected with one end of said cylinder, a plunger operated by said eccentric and having an air cushion pocket, means for actuating said plunger, a reciprocatory hammer adapted to slide in said cylinder having a head adapted to cushion in the air pocket of the plunger, said cylinder having air por-ts adapted to register with said cylindrical cutouts of said casing in the nonoperative position and said air ports not registerin with the cylindrical cutouts when the todl holder and cylinder are pushed upwardly to the operative position.

4. In a vacuum power hammer the combination of a power driven eccentric, a plunger having an air cushion pocket and adapted to slide in a cylinder movable longitudinally in an outer casing, said outer casing havlng air ports, cylindrical cutouts and longitudinal borings connecting the lower air of said cutouts, a hammer having a head adapted to cushion in said plunger air pocket, air ports in said cylinder normally registering with the cylindrical cutouts in sa1d outer casing, means for interrupting such registration, and means for operating said plunger comprising said eccentric having a driver plate and a driven late, a counterbalancesecured to each, an a connecting arm eccentrically connecting said plates to said plunger.

5. In a vacuum power hammer the combination of an outer casing having air ports, cylindrical cutouts and longitudinal borings Lamme connecting the lower pair of said cutouts, a longitudinall movable' cylinder mounted therein and limited thereby in'its downward movement and havin air ports, a tool holder separately secure to said cylinder and under constant s ring tension against said outer casing, a unger and hammer adapted to slidem said cylinder, means for interrupting the maintaining -of atmospheric pressure between the hammer and lunger, consistin of said air ports, cylindricalv cutlongitudna borings, means for p atean "ajdriven plate, a counter-'balance seouredjto eachand afconnecting arm ecoe'ntrically connecting'e''saidH plates to said 6. In a -vacuumlpow'er hammer the combination of an outercasing having air ports, j

20 y connecting said lower pair of-"cutouts a cyl.-v fr inder with va tool'holder separabl l,connect-f ed to/one end of said cylinder an -air orts cylindrical cutouts and `longitudinal lborings 1 balance secured to each and a connecting 'arm eccentrically connecting said plates to said plunger.

In testimony whereof I aix my signature.

LOUIS E. GroLLv.y 

